Radioactivity is
A) the spontaneous emission of radiation from unstable elements.
B) the emission of light from certain substances after exposure to sunlight.
C) the spontaneous emission of radio waves from matter.
D) the emission of light from matter when exposed to radio waves.
Correct Answer:
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Q8: Ions are
A)charged atoms (or groups of atoms).
B)electrons.
C)neutrons.
D)electrodes.
Q9: When combined with Thomson's determination of the
Q10: A stream of electrons in a magnetic
Q11: An anion is a
A)negatively charged ion.
B)positively charged
Q12: A cation is a
A)negatively charged ion.
B)positively charged
Q14: The existence of positively charged particles in
Q15: Millikan's "oil drop" apparatus allowed for the
Q16: Some chemicals which are exposed to sunlight
Q17: The application of electricity to chemical systems
Q18: A cathode is a
A)negatively charged ion.
B)positively charged
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